package socket.socket_2;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Server {
    private ServerSocket serverSocket;
    private List<PrintWriter> allOut = new ArrayList<>();

    public Server() {
        System.out.println("启动服务端... ");
        try {
            serverSocket = new ServerSocket(8088);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("服务端启动完毕");
    }

    public void start() {
        System.out.println("等待客户端连接...");
        Socket socket = null;
        while (true) {
            try {
                socket = serverSocket.accept();
            } catch (IOException e) {
                e.printStackTrace();
            }
            System.out.println("一个客户端连接了");
            HandlerClient handler = new HandlerClient(socket);
            Thread t = new Thread(handler);
            t.start();
        }
    }

    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }


    class HandlerClient implements Runnable {
        private Socket socket;
        private String host;

        public HandlerClient(Socket socket) {
            this.socket = socket;
            host = socket.getInetAddress().getHostAddress();
        }

        public void run() {
            PrintWriter pw = null;
            try {
                InputStream in = socket.getInputStream();
            InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
            BufferedReader br = new BufferedReader(isr);

                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out, StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw,true);

                synchronized (allOut) {
                    allOut.add(pw);
                }
                System.out.println(host + "上线了，当前在线人数：" + allOut.size());
                String message;
                while ((message = br.readLine()) != null) {
                    System.out.println(host + "说：" + message);

                    for (PrintWriter o : allOut){
                        o.println(host + "说：" + message);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                synchronized (allOut) {
                    allOut.remove(pw);
                }
                System.out.println(host + "下线了，当前在线人数：" + allOut.size());
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}